Chemical Reactions (8 marks)
- Balance: Fe + H₂O → Fe₃O₄ + H₂; identify type.
- Rancidity prevention; corrosion example.
- Double displacement: Na₂SO₄ + BaCl₂ → ?.
- Exothermic/endothermic: CaO + H₂O → Ca(OH)₂ + heat.
- Oxidation in Mg + O₂ → 2MgO.
Acids, Bases, Salts (7 marks)
- pH scale; strong acid pH=1 example.
- Acid + metal → salt + H₂; HCl + Zn.
- Universal indicator colors for acids/bases.
- Baking soda reaction with acid.
- Plaster of Paris formula/use.
Metals & Non-Metals (7 marks)
- Reactivity series: arrange K, Mg, Fe, Cu.
- Electrolysis of molten NaCl products.
- Ionic bond in NaCl formation.
- Aqua regia composition.
- Alloy: brass constituents.
Carbon Compounds (8 marks)
- Versatile nature of carbon (catenation).
- Ethanol + ethanoic acid → ester.
- Saturated/unsaturated: test with Br₂ water.
- Homologous series example: alkanes.
- Soaps vs detergents.
Life Processes (12 marks)
- Autotrophic nutrition equation: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.
- Human heart: 4 chambers diagram/label.
- Nephron function in kidney.
- Stomata role in transpiration.
- Lymph vs blood.
Control & Coordination (7 marks)
- Reflex arc diagram.
- Plant hormone: auxin for phototropism.
- Feedback in insulin secretion.
- Neuron structure.
- Endocrine glands: thyroid hormone.
Reproduction (7 marks)
- Sexual/asexual: binary fission in Amoeba.
- Flower parts: pollination types.
- Contraceptive methods.
- Menstrual cycle phases.
- Reproductive health issues.
Heredity & Evolution (5 marks)
- Mendel’s monohybrid ratio 3:1.
- Sex determination in humans.
- Fossils as evolution evidence.
- Acquired vs inherited traits.
- Human evolution stages.
Environment & Resources (10 marks)
- Food chain: 3 trophic levels example.
- Ozone depletion cause.
- 3R principle.
- Water conservation: rainwater harvesting.
- Biodegradable vs non-biodegradable.
Physics: Light, Electricity, Magnetism (25 marks total)
- Lens formula: object 20cm, f=10cm image distance.
- Ohm’s law graph; V=IR numerical.
- Right-hand thumb rule Fleming’s.
- Human eye defects: myopia correction.
- Power: 5A, 220V iron energy in 2hrs.
These are the most important question for class 10th science for boards exam 2025-2026 for cbse and state boards as well .
